Keyboard



FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing of the lower portion of the keyboard is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 